Automatic Phase Selector (APS)
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#1
15-06-2010, 03:53 PM


Abstract:
Auto Phase Selector (APS) system is used to ensure continuous supply to load in case mains supply is not healthy. This unit is very useful at the sites at which mains supply is irregular. It may be sometimes very high or sometimes very low voltage. The frequent failures/fluctuations of power affects life of power plant and battery. The objective of the APS is to ensure that there is continued commercial power supplied to the site at all times so as to ensure that the Base Transceiver Station (BTS) runs on commercial power until all available phases are either out of electrical tolerance or completely off. This is a micro controller based unit and is used with three phase electrical supply. Whenever the supply of one or two phases of a three phase electrical line goes off, the APS system automatically distributes the electrical supply from the active phase to the failed phases. This ensures continuous power supply through all the three phases even if one phase is active.
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oscobi
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#2
08-07-2010, 10:57 AM

Sir. I will be glad to have a detail information on this project and implimentation. Thanks for your good works.
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Danno4krist
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#3
05-04-2011, 05:12 AM

I'm working on my final year project and implimentation and i need info on automatic phase selector; actually between three phases. How can i get info on a past similar work that has been done before now?
Thanks
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#4
05-04-2011, 12:11 PM

Hi, Danno4krist
To do the switching need to use SSR's, Solid State Relays, they can react in one half of a cycle. However being jumping from phase to phase have some phase overlap issues that would require a added half cycle delay between shut off one phase to the connection of another phase. Plus switching phases on the go will cause some possible spiking issues due to the AC current cycles jumping ahead or back 120 degrees time wise.

However to get a reasonable voltage reading off each phase it would still take a few cycles for the system to accurately detect a low voltage condition and make the needed choice of which phase line is the best next alternative.

might be to use back to back SCR's as the switching elements, with phase and voltage detection to decide on the switching action.
As one phase goes low, turn that phase off and turn the other phase on. If done right this might work if the lines dont go down too often in a day.
It would surely be a good idea to test this in a simulator first however to make sure the switching matrix method works ok. There will most likely have to be phase detection to get the switching action correct.
For the switching, perhaps a micro controller or PROM and associated comparators to make the decisions.

If the switching SCR's dont work because of too much phase overlap, have to use an alternate means such as a transistor with bridge rectifier. I think you would have to analyze the effect of switching one phase to the other first anyway though, the effect on the load. The load may have to take a brief interruption in power. If that's not a problem, SCR's would work ok.
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#5
08-10-2012, 01:57 PM

i want the circuit diagram of phase selector for my project and implimentation and some detailed info about its working...i;ll be glad if u help me...
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